1966 年 86 巻 10 号 p. 932-943
Air oxidation of furfural in alkaline solution at 40° in the presence of Ag2O-CuO catalyst was studied, employing a batch reactor and a multi-stage contactor of gas-liquid counter-flow type. In the initial step, the rate of reaction was 0 th order and in the successive one it was proportional to the concentration of furfural and the catalyst, and the amount of by-products was negligible. As the stripping of furfural from the reaction mixture was observed, some stages for absorption of gaseous furfural into liquid were provided above the feed stage for furfural. It was noted that gas-liquid equilibrium did not fit Henry's law under the operating conditions. Assuming the fictious equilibrium lines for absorption and desorption, mass balance equations for each stage were obtained. The curves calculated by adopting the Runge-Kutta method, and the values under steady state by trial and error method agreed well with experimental data. Within the operating condition (0<x<6.5×10-4[-], 0.6<GM<1.3 [g.-mole/min.]), the over-all volumetric coefficient of mass-transfer Kxa was 3∼12[g.-mole/L.min.Δx].